243819691388 has 48 divisors (see below), whose sum is σ = 526083317760. Its totient is φ = 96284735424.

The previous prime is 243819691321. The next prime is 243819691397. The reversal of 243819691388 is 883196918342.

It is a super-2 number, since 2×243819691388² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243819691388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389948 + ... + 799811.

It is an arithmetic number, because the mean of its divisors is an integer number (10960069120).

Almost surely, 2^243819691388 is an apocalyptic number.

243819691388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

243819691388 is an abundant number, since it is smaller than the sum of its proper divisors (282263626372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243819691388 is a wasteful number, since it uses less digits than its factorization.

243819691388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190346 (or 1190344 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 62.

The spelling of 243819691388 in words is "two hundred forty-three billion, eight hundred nineteen million, six hundred ninety-one thousand, three hundred eighty-eight".